How Can I Determine if a Native DLL is Compiled for x86 or x64 from Managed Code?

Determining x64 or x86 Compilation of Native DLLs in Managed Code

In order to differentiate between x64 and x86 compiled native assemblies from within managed code applications (C#), it is necessary to access the PE (Portable Executable) header information. This header includes crucial details about the DLL's architecture. Here's how you can accomplish this using a variety of methods:

1. Using DUMPBIN Tool:

DUMPBIN is an incredibly useful tool for inspecting DLL headers. By employing the "/headers" or "/all" flags, one can obtain the initial file header, which contains the machine type information:

dumpbin /headers cv210.dll

If the "machine" value is 8664, the DLL was compiled as x64; otherwise, for a value of 14C, it was compiled as x86.

2. Using 'find' Command:

This command can simplify the process by filtering out the specific information we need:

dumpbin /headers cv210.dll |find "machine"

This operation will display the machine type value, indicating whether the DLL is x64 or x86 compiled.

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